The process of sliding the arched structure into place to shield the damaged unit 4 of the Chernobyl nuclear power plant in Ukraine has been completed, the European Bank for Reconstruction and Development has announced. London-based EBRD said a ceremony in Chernobyl today marked the successful conclusion of the sliding operation, which it described as a key milestone before finalisation of the international program to transform Chernobyl into an environmentally safe and secure state by November 2017.